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src/mathutils.c: use smpl_t for constants

--- a/src/mathutils.c

+++ b/src/mathutils.c

@@ -442,6 +442,7 @@

 smpl_t fvec_quadratic_peak_pos (fvec_t * x, uint_t pos) {

   smpl_t s0, s1, s2; uint_t x0, x2;

+  smpl_t half = .5, two = 2.;

   if (pos == 0 || pos == x->length - 1) return pos;

   x0 = (pos < 1) ? pos : pos - 1;

   x2 = (pos + 1 < x->length) ? pos + 1 : pos;

@@ -450,7 +451,7 @@

   s0 = x->data[x0];

   s1 = x->data[pos];

   s2 = x->data[x2];

-  return pos + 0.5 * (s0 - s2 ) / (s0 - 2.* s1 + s2);

+  return pos + half * (s0 - s2 ) / (s0 - two * s1 + s2);

 }

 smpl_t fvec_quadratic_peak_mag (fvec_t *x, smpl_t pos) {